Guard for punch presses



Jan. 3, 1928. 1,655,271.

` EJSCHWGER 'GUARD FOR PUNCH PRESSES Filed Sept. 5L 1925 4 Sheets-Sheet l "nur/ llmllllllm... /Ee-:L

.Mmmm

Jan. 3, 1928,

Filed Sept. 5.* 1925 E. lscHlNGl-:R

GUARD FOR-PUNCH PRESSES 4 She'ets-Sheet 2 Jan. 3, 1928.

1,655,271 E. ISCHINGER GUARD FOR PUNCH PRESSES Filed Sept. 5. 1923 4 Sheets-Sheet 3 IN V EN TOR.

LLAMA L A E. lscly-HNGER GUARD FOR PUNCH PRESSES v 4 Sheets-Sheet 4 v Filed Sept. 5. 1923 INVENTOR.

LTI

Patented Jan. 3, 1928.

, UNITED ASTATES PATENT OFFICE.

ERIC ISCHINGEB, OF RO(SI'III'ES'JER7 NEW YORK, ASSIGNOR OF ONE-HALE T0 FRANK KEIPER, OF ROCHES'IEltD NEW YORK.

GUARD FOR PUNCH PRESSES.

Application led September The object of this invention is to provide an improved safety guard for punch presses and other similar metal working or Wood working machines to protect the'danger point of such machines by brushing the operators hand out ofdanger to safety when the machine is operated.

This and other objects of this invention will be fully illustrated in the drawings. described in the specification andrpointed out in the claims at the end thereof.

In the accompanying drawings:

Figure 1 is a perspective view of a punch press equipped with the improved safety guard.

Figure Q is a vertical sectional view of the oscillating member of the guard and its mounting.

Figure 3 shows detail perspectiveviews of the two parts of the oscillating member and the stud on which they are mounted to oscillate. v

Figure 4 is a front elevation of a punch press with a modified form of the improved guard mounted thereon.

Figure 5 is a side elevation-of the punch press and guard illustrated in Figures.

Figure 6 is a detail sectional view of the universal connection between the pitman of the press and the .improved safety guard.

Figure 7 is a side elevation of a punch press with another modied form of the guard mounted thereon.

Figure 8 is a front elevation of the punch press and guard illustrated in Figure 7.

Figure 9 is a detail perspective view of the connection betweenr the pitman of the press and the safety guard.

Figure 10 is a horizontal sectional view of the pitman and connecting bearing block of the satety guard.

yl `igure 11 is a side elevation of a press with another modified form of theimproved safety guard mounted thereon.

Figure 12 is a front elevation of the press and the safety guard illustratedy in Fign ure 11.

Figure 13 is a detail perspective view of the connection between the pitman of the press and the safety guard.

Tn the several ligures of the drawings like reference numerals indicate. like parts.

The safety guard forming the subject matter of my present invention is constructief to make the guard operable from any mov- `threaded studs 14 and 15.

5, 1923. Serial N0. 661,116.

ing member of the machine which it is to guard. In this way it is made possible to :provide the' greatest efficiency bot-h in the operation of the guard and the lsimplifying ot its adjustment and the protection that it'aiiiords through its operation.

rThe guard is of the pendulum type, is positively driven at each operation of the machine and is provided with the guard arm .1 that carriesthe vane or shield 2 at the lower end thereof. This guard arm is operated by an oscillating member 3 having a `.laterally projecting short arm i formed near the outer end thereof. The arm ft is provided with the sleeve 5 so that the upper end of the guard arm can pass therethrough and be adjustably clamped in pla-ce therein by means of the set screw 6.

A second and threaded sleeve 7 is provided on the oscillating member 3 near the rear end thereof. A threaded rod 8 is mounted in thisl sleeve and can he threaded in and out therefrom to. increase-or decrease the length that .it projects from one side of the oscillating'v member 3. The adjustable arm formed by thethreaded rod 8 is provided with an eye 9 and this eye engages between the bifurcated end of the shackle `10. A pin 11 passes through eyes formed in the bifurcated end of the shackle and the eye E) of the threaded arm or rod 8 to connect this shackle to the arm.

The shackle 10 in turn is connected to the ram 1Q of the press and for this purpose a turn buckle 13 is provided. Thisturn buckle has the usual right and left hand threaded ends that engage with correspondingly The stud 14 is threaded into the shackle 10 while the stud 15 is provided with an eye 16 that is pivoted to the ram 12 by means of the cap screw 1T.

The oscillating member 3 is mounted to oscillate on the bearing pin 18. This pin is threaded at one end and is mounted in a correspondingly threaded hole provided for this purpose in the frame of the press. A locknut 19 provided on the threaded end of lthe bearing pin 18 serves to anchor the bearing` pin in place on the frame.

The oscillating member 3 rests against a shoulder formed by a nut' 2() which for this purpose is theaded on the bearing pin 18 as illustrated in Figure 2.

The oscillating member may be made up the oscillating member are held together so that the dowel pins 2 1 engage the holes 22u and this is vdone by means of the expansion spring 23 surrounding` a portion of the outer end of the bearing pin 18. This spring is interposed between the washers 241 and 25`one resting against the outer end of the oscillating member 3 and the other held in place by the Cotter pin 26 provided for this purpose in the outer end of the bearing pin 18. The pressure from the expansion of this Spring holds the two sections of the oscillating member keyed together by forcing the dowel pins 21 carried by theouter section into the holes 22 provided inthe inner section of the oscillating member 3. This makes the two sections of the oscillating member operate as one when oscillated on the reciprocation ofthe ram of the press. The engagement of the dowel pins 21 with the holes '22 can be made to hold the guard arm 1 in any Vangular position by first disengaging the pins from the holes so as to separate the two vsections of the oscillating member then turning the section of the oscillating member carrying the guard arm until it has attained the desired angular position. The dowel pins 21 are then allowed to engage again into holes22 which for this purpose are grouped concentric around the bearing pin 18 as illustrated in Figure 3. The guard arm may i thus be given any angular starting position that is necessary to provide the desired swing of the arm in front of the ram of the press. A further adjustment for changing the angular position of the guard arm 1 and the length of the arc through which it swings is secured by lengthening or shortening the turnbuckle 13 and the distance the threaded arm 8 projects from the oscillating member 3.

Y Five adjustments are thus possible to secure the proper and most efficient operation of the guard arm in front of the danger point of the press.

First the lengthening or shortening of the threaded arm 8 will decrease or increase the travel of the guard arm for a given stroke of the ram of the press.

Second the independent angular adjustment of the guard arm by means of adjustment of the outer section of the oscillating member on the inner section thereof this securesa quick adjustment of the initial starting position for the guard arm and provides means whereby the guard arm can be quickly thrown to one side from in front of the press so that the guard will not form an obstruction when setting the die or removing it from the press.

Third the adjustment of the angular position of the guard arm which is secured by the lengthening or shortening of the connection between the oscillating member and the ram of the press which is secured by the adjustment of the turnbuckle 13. This is a similar adjustment to that secured by the adjustment of one section of the oscillating member with relation to the other except that the adjustment by means of the turn buckle is much finer so that the final angular adjustment is made with the turn buckle.

The fourth adjustment of the guard arm 1 is secured by sliding of the guard arm 1 up or down in' the sleeve '5 of the.` oscillating member 3. This secures a vertical adjustment of the/guard arm for the purpose of locating the vane or shield 2 'of the guard arm at the proper elevation in front of the die in the press.

The fifth adjustment is provided to locate the guard in the propel' position in front of the press. This adjustment is secured by threading the bearing pin 18 in or out of the frame of the press and thus bodily moving the oscillating member 3 toward or away from infront of the press and then locking it in the proper place by means of the loch nut 19.

In the modification of the guard illustrated in Figures 4 to 6 inclusive the guard is operated from the pitman 30 of the press. For this purpose a stud 31 is clamped to the pitman byr one of theconnecting rod bolts 32. This stud is threaded and has a sleeve 33 threaded to theA outer end thereof. B v threading the sleeve in and outon the stud the arm formed by the stud and sleeve can be made 'longer or shorter as the need arises when mounting the guard to the press. A locknut 341` is provided on the stud to hold the sleeve at the desired position on the stud.

On the outer end of the sleeve is formed the ball member 35. This ball member engages into the ball socket 36 carried on the upper end of the turnbuckle connection 37. The turnbuckle connection is the same as is described in connection with the guard illustrated in Figure 1, and carries the shackle 38 at the lower end thereof to engage the outer end of the arm 3f) of the oscillating member 40.

The arm 39 of the oscillating member 4l) instead of being threaded thereto as illustrated in Figure 1 is held in place by means of a pair of collars 4-1 and 4-2 one on cach side of the sleeve 43. The arm 39 can be adjusted in and out of the sleeve 43 by shiftthe turnbuckle connection in and out as well as up and down. It is the up and down motion given to the turnbuckle connection and communicated to the oscillating member that operates the guard arm but at the same time the in and out motion ot the turnbuckle connection must be taken care of by allowing the arm 39 to freely rock back and forth in the sleeve 43 at each operation of the press. The corresponding rocking motion ot' the upper end ot the turnbuckle connection is taken care of by the ball and socket connection between the stud 3l and the turnbuckle connection.

In the modification of the guard illus trated in Figures 7 to 10 inclusive the guard is operated from the pitman ot' the press below the connecting rod head. For this p urpose a. bearing block 5() is provided. This bearing block has a triangularly shaped channel 5l provided at the back thereotI which is adapted to embrace a portion ot the round surface of the pitman by clamping it in place therein by means of the bolt 52. In this way the bearing block is not only clamped in place on the pitman but is also automatically lined up with the vertical axisthereof and rigidlv held in this position from which it cannot shift until released by.

the bolt 52'.

In the bearing 53 formed on the bearing block is mounted to rock the shaft 54. The shaft. is held against, endwise movement in the block byv means of the collars 55 and 56 Vone Vat each end ot the bearing 53. The outer end vof the Vshaft 54 has the eye 54A formed thereon which engages between the bifurcated ends oit the shackle 56A. A threaded connecting rod 57 connects the 'shackle 56^ with the shackle and forms the connection between the pitman and the Yguard in the same way as do the turnbuckle of the press by means ot the bolts 6l and 62. An arm 63 is threaded into the bearing ofthe bearing block GO and locked in` place against rotation by means or' the locl'- nuts 64 and 65 one at each end ot the bearing block. l

At the free end the arm 63 has the sleeve 63A pivoted thereon. A pair of collars 66 and 66A are provided on the arm 63 to hold the sleeve 63A against endwise movement on the arm 63 but allow a free oscillating mo tion of the sleeve on the arm. On the sleeve is provided a tongue 67 that is adapted to project into the bifurcated end ot the shackle 68. A pin 69 connects the shackle 68 with the tongue 67 and completes the driving connection of the guard between the arm 39 andthe arm 63 through the threaded link STO. The operation of the guard illustrated in Figures ll to 13 inclusive is the same as that described in connection with the guard illustrated in Figures 4 to l0 inclusive e2;- ceptthat the arm 63 mounted on the head of the pitman is held against rotation but instead of this is provided with an oscillating sleeve 63A that allows the connection betweenthe guard proper and the head of the pitnian to freely operate without binding.

' As pointed out, the improved guard and its modifications are intended to be mounted on a press in a way that will secure maximum ethciency in the operation and the adjustment of the guard, in each particular case. For this purpose it may be necessary to operate the guard illustrated in one of the igurcs of the drawingin the manner in which the guard illustrated in one of the other figures of the drawing is operated. In other words lan'interchanging of the parts of the guards illustrated in the ligures of the drawings with such slight modifications as are necessary to make the guard operate in the desired manner is therefore within the scope of my invention.

For example the guard illustrated in Figure l may be driven from the pitman of the press instead of being driven from the ram of the press as shown in this figure. For this purpose the connection between the ram of the press and the oscillating member o the guardy illustrated in Figure l can be replaced by either one of the 'pitman connections illustrated in Figures 4, 8 and 12 and of these connections the most desirable one for the particular case may be used. These and other combinations of the parts disclosed are included in my invention and meant by the above statement.

' I claim:

1. In a guard for punch presses', the coinbination of a bearing or pivot pin, an oscillating member mounted on said pin, an arm having threaded engagement with Said oscillating member, alink connecting the end of said arm with the movable member of the press, and holding` said threaded arm in a predetermined position in said oscillating member, a guard carried by said oscillating member.

2. In a guardv for punch presses the combination of a bearing or pivot pin, an oscillating member mounted on said pin, said oscillating member comprising an inner and an outer section, means for yieldingly hold- -ing said inner and said outer section of said chored in the frame of a press, said studbeing threaded at one end and being left smooth at the other end, a nut threaded against the inner end of the threaded portion of said pivot stud to form a shoulder thereon, a locknut carried by said threaded portion and adapted to adjustably lock said f lpivot stud to the frame of the press, an

oscillating member pivoted on said pivot stud, a guard member carried by said oscillating memberand means for connecting said oscillating member with a movable member of the press.

4. In a guard Jfor punchpresses the combination of a pivot stud, adapted to be anchored in the frame of a press, said pivot stud being threaded at one end and being left smooth at the other end, a nut Jforming a shoulder on said pivot stud to separate the threaded portion and the bearing portion of said pivot stud, said nut being adjustable on said threaded portion to increase or decrease the length of said bearing portion of said pivot stud, an oscillating member pivoted on said pivot stud, said shoulder o-n said stud forming a thrust bearing for said oscillating member, a guard arm carried by said oscillating member and means to operate said oscillating member and with itv said guard arm on the operation of said press.

5. In a guard for punch presses, the combination of a pivot stud, an oscillating member comprising two sections pivoted on said pivot stud, a shoulder on said stud forming a. thrust bearing for one section of said oscillating member, a pincarried by one of said sectionsand a. hole formed in the other of said sections, a spring vsurrounding the outer end of said stud, a head fastened on the end of said stud, said spring being interposedbetween said head and said oscillating member, and forcing said sections of said oscillating member against each other With theV pin of the one section engaging the hole of the other section, an arm carried by one of said sections and a'guard carried by the other of'said sections, a. link connecting said l armvvith the ram of the press.

V ,6; In a guard for punch presses, the combination of a pivot stud, an oscillating member pivoted Aon said pivot stud, annarm lthreaded into said oscillating member, a link connecting said arm With the movable member of the press, said link also holding said threaded arm against rotation in said oscillating member to lock said arm against lateral movement on said oscillatingmember, and a guard arm carried bysaid oscillating member. 7. In a guard for punch presses, the cmbination of a pivot stud, a pair of oscillating members Ypivoted on said pivot stud, means for locking said oscillating members together to operate as a unit, and means for adjusting said oscillating members with relation to each other, a guard arm carried-by one of said oscillating members and means connecting the other of said oscillating members with a movable member of the press.V

8. In a guard for punch presses, the combination of a pivot stud, an oscillating member pivotedon said pivot stud, a threaded sleeve carried by said oscillating member, a

threaded arm engaging said threaded sleeve and being left free to be threaded in and out of said threaded sleeve, a link connecting the outer end of said threaded arm With the movable-member of the press and holding said threaded arm against rotation in said threaded sleeve when connectedto the movable member of the press.

9. In a guard for punch presses, the Vcombination of a pivot stud, an oscillating member pivoted on said pivot stud and comprising an inner and an outer section, one of said sections of said oscillatingmember' carrying an operating arm 'andthe other of said sections of said oscillating member carrying ,a guard arm, and means for angularly adjusting the section of said'oscillating member carrying said operating arm with relation to the section of said oscillating member carrying said guard arm.

10. In a guard for punch presses, the com- Y bination of a pivot stud, an oscillating member pivoted on said pivot stud, said oscillating member carrying a `rigid and an adjustable arm, saidrigid arm having a sleeve formed on the outer end thereof, a ,guard arm adjustably clamped in place in said sleeve, a turn buckle connecting said adjustable arm with the movable member of the press, said turn buckle being adapted to lengthen or shorten the Connection between said oscillating member and the movable member of the press to fix the initial starting position of the guard arm carried by said oscillating member.

11. In a` guard for punch presses having a movable member provided with a curved wall, the combination of a pivot stud, an oscillating member pivotedon said pivot stud, a bearing block, a V shaped seat formed at the back of said bearing block and means'for clamping said- V shaped seat against the curved Wall of the movable member of the press to rigidly support said bearing block on the movable member of the press, and means connecting said bearing block with said oscillating member.

l2. In a. guard for punch presses, having a pitman, the combination of an oscillating member, a guard carried by said oscillating member, a block having a. V shaped channel formed on one side thereof, said block being clamped to the pitman of the press with the sides of the V shaped channel embracing a. portion of the perimeter of the pitman to align said block With the axis of the pitman and hold it against turning thereon, a link connection between said block and said oscillating member to operate the guard carried by said oscillating member on the movement of the pitman of the press.

13. In a guard for punch presses, the combination of a pivot pin, an oscillating member mounted on said pivot pin, a sleeve provided on the periphery of said oscillating member near one. end thereof, a rigid arm projecting from said oscillating member near the other end thereof, a sleeve formed in the end of said arm, an arm adjustably mounted in and out of said sleeve provided on said oscillating member, a guard adjustably mounted in the sleeve at the end of said rigid arm, al forked link connected to the outer end of said adjustable arm mounted in said sleeve, a second link connected to the movable member of the press and a turn buckle connecting said links.

In testimony whereof I affix my signature.

ERIC ISCHINGER. 

